MAC Mini wont turn on but the fan is constantly running loudly.

Hey, I'm new to MAC's and apple etc, I mostly use PC's and such but had to get a MAC for work purposes. Up to now it has been great and I can see why they are brill machines but last night when it wasn't even switched on the fan started up and now I can't even turn the Mini on. The only way to stop the fan (which sounds like a hair dryer - the only way I can describe it) is to unplug it at the mains. I'm worried that someone is going to tell me its bust and will cost a small fortune to repair but hey I gotta know.
Thanks.
Also I have tried pressing down the button to restart it etc but it just doesn't respond.

I am also having the same problem.
I came home after a long business trip to find that my computer was unplugged by my wife. After plugging it back in, fan on high, and no LED light.
I was quoted 500-600 to get it fixed. I bought the darn thing for only $450.
SMC reset has absolutely no effect what so ever.

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